897391531 has 4 divisors (see below), whose sum is σ = 897768000. Its totient is φ = 897015064.

The previous prime is 897391499. The next prime is 897391541. The reversal of 897391531 is 135193798.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 897391531 - 2⁵ = 897391499 is a prime.

It is a super-2 number, since 2×897391531² = 1610623119821047922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (897391541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184636 + ... + 189433.

It is an arithmetic number, because the mean of its divisors is an integer number (224442000).

Almost surely, 2^897391531 is an apocalyptic number.

897391531 is a deficient number, since it is larger than the sum of its proper divisors (376469).

897391531 is a wasteful number, since it uses less digits than its factorization.

897391531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376468.

The product of its digits is 204120, while the sum is 46.

The square root of 897391531 is about 29956.4939704232. The cubic root of 897391531 is about 964.5557230769. Note that the first 3 decimals are identical.

The spelling of 897391531 in words is "eight hundred ninety-seven million, three hundred ninety-one thousand, five hundred thirty-one".